Rewrite app as a lightweight Snake game and remove prime-checker

[tomadowley]

This PR replaces the old Prime Checker UI with a self-contained Snake game.

What changed:

• App now renders a new SnakeGame component instead of PrimeChecker and removes the old logo usage.
• Added SnakeGame.tsx: a canvas-based snake game with arrow-key controls, Space to pause, R to restart, and a score display. It includes a game-over overlay and accessible score labeling. Test IDs and ARIA attributes added to support tests (snake-canvas, start-btn, pause-btn, restart-btn, and aria-label on the score element).
• Updated tests:
  • src/App.test.tsx now tests for the snake game UI (score label, start/pause/restart controls) instead of prime checker text.
• Removed old PrimeChecker component and its tests, along with isPrime logic and PrimeChecker.test.tsx.
• Cleaned up related files by deleting PrimeChecker.tsx and associated test suites.

How it solves the task:

• Rewrites the app to a fun, interactive Snake game while keeping a clean, self-contained component. It removes the previous prime-checking functionality and related tests, aligning the project with the new feature goal.

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This pull request was co-created with Cosine Genie

Original Task: sorbox/wr2e9snq7fpx
Author: Tom Dowley

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Project	Deployment	Preview	Comments	Updated (UTC)
sorbox	Ready	Preview	Comment	Dec 4, 2025 3:30pm